<!DOCTYPE html>

<html>

<head>
    <title></title>
</head>

<body>
    <div id="list-complete-demo" class="demo">
        <button v-on:click="shuffle">Shuffle</button>
        <button v-on:click="add">Add</button>
        <button v-on:click="remove">Remove</button>
        <transition-group name="list-complete" tag="p">
            <span v-for="item in items" v-bind:key="item" class="list-complete-item">
              {{ item }}
            </span>
        </transition-group>
    </div>
    <script src='../vue.js'></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.14.1/lodash.min.js"></script>
    <script>
        new Vue({
            el: '#list-complete-demo',
            data: {
                items: [1, 2, 3, 4, 5, 6, 7, 8, 9],
                nextNum: 10
            },
            methods: {
                randomIndex: function () {
                    return Math.floor(Math.random() * this.items.length)
                },
                add: function () {
                    this.items.splice(this.randomIndex(), 0, this.nextNum++)
                },
                remove: function () {
                    this.items.splice(this.randomIndex(), 1)
                },
                shuffle: function () {
                    this.items = _.shuffle(this.items)
                }
            }
        })
    </script>
    <style>
        .list-complete-item {
            transition: all 1s;
            display: inline-block;
            margin-right: 10px;
        }

        .list-complete-enter,
        .list-complete-leave-to
        /* .list-complete-leave-active for below version 2.1.8 */

        {
            opacity: 0;
            transform: translateY(30px);
        }

        .list-complete-leave-active {
            position: absolute;
        }
    </style>
</body>

</html>